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Caffeine has a stimulating affect on the heart, not the nervous system. An oral dose of 200 mg caffeine appears to decreasereaction time by approximately 4 percent within 30 minutes, approximately 15 percent in 30 to 60 minutes and 18 percent in 60-90 minutes.

Therefore caffeine does not wake up the nervous system.

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Q: How many milligrams of caffeine do you need to wake-up the nervous system?
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